Refining mill of the roll and adjustable breast bar type



Dec. 11, 1934. H E cox ET AL 1,983,736

REFINING MILL OF THE ROLL AND ADJUSTABLE BREAST BAR TYPE Fil'ed Jan. 22, 1932 3 Sheets-Sheet l ATTORNEXS H. E, COX ET AL 1,983,736

REFINING MILL OF THE ROLL AND ADJUSTABLE BREAST BAR TYPE Dec. 11, 1934.

Filed Jan 3 Sheets-Sheet 2 /N 1 5 N TORS A TTOR/VEXS' Dec. 11, 1934. H. E. cox ET AL REF'INING MILL OF THE ROLL AND ADJUSTABLE BREAST BAR TYPE 3 Sheets-Sheet 3 Filed Jan. 22, 1932 1 5 Tom Fig. 4.

Patented Dec. 11, 1934 UNITED STATES PATENT orrlcs REFIN'ING MILL OF THE ROLL AND ADJUST- ABLE BREAST BAR TYPE Application January 22,

1932, Serial No. 588,066

In Great Britain January 31, 1931 6 Claims.

The present invention relates to improvements in or relating to refining mills of the roll and adjustable breast bar type, particularly for treating fluids or semi-fluids such as paint, enamel,

ink, soap, chocolate and the like.

An object of the present invention is to provide a refining mill of the roll and adjustable breast type in which undue pressure between the bar and the roll which Wastes power and tends to grind away the bar and roll and destroy their truth, and uneven refinement and finish of the treated material, are avoided.

According to the present invention there is provided a roll and breast mill having a spring 5. urged breast bar, in which the spring reacts at a predetermined value during the passage ofthe material between the bar and the roll, and also having independent means whereby the bar and roll can be brought into desired contacting or non-contacting working setting with, in the former case, little or no pressure at the contacting surfaces. p

A fine setting may be provided by means of a micrometer adjustment.

Thus by the present invention the recession of the breast bar and roll is yieldingly opposed so that the working pressure to be exerted on the film passing between the bar and the roll shall be that applied by an adjustable spring action by which such working pressure is predetermined, and in providing a parallel adjustment, a. micrometer adjustment for preference, of the bar so that the bar and roll can be brought into actual contact with little or no pressure at the contacting surfaces, or, alternatively can be brought into a desired non-contacting working setting.

In order thatthe present invention maybe the more readily understood, reference is hereinafter made to the accompanying drawings, in which Fig. 1 is a side elevation of a mill incorporating the present improvements.

Fig. 2 is a plan view thereof.

Fig. 3 is a part sectional elevation of the breast bar and its mounting.

Fig. sis an under plan view thereof. 7

Fig.5 is a longitudinal sectional plan view of thebreast bar and mounting.

In one constructional form by way of example of the present invention a strong compression spring 1 is provided bearing at its end remote from the roll 2 against the internal shoulder 3 of a recessed boss 4 in the cap 5 of the hopper saddle. 6. in which the breast bar 7 is housed so as to be capable of a radial sliding movement with respect to the roll 2.

At its end nearer the roll 2 the spring 1 bears against the flanged end 8 of a tube 9 which passes through and projects beyond the recessed boss 4 ,5

which houses the spring 1 and is externally threaded to take a screw nut 10, the tightening or slackening of which adjusts the spring 1 to the pressure desired according to the nature of the material to be treated. V

The tube 9 is internally screw threaded to receive a micrometer screw 11 which is related to a calibrated scale 12, 13 and passes through the tube 9 and bears directly or indirectly (e. g. through the medium of a sheath 14 in which the bar is fixed) against the breast bar '7 so that this can be brought into contact with the roll 2 with little or no pressure at the contacting surfaces, or alternatively, the breast bar 7 can be appropriately adjusted to fine clearances with respect 20 to the roll 2.

Such a non-contacting setting, by way of example, may be carried out by placing the bar 7 under the influence of a spring action which may be adjustable and which normally tends to draw the bar away from the rolls.

As shown the spring action may consist of spindles 15 passing through bosses 16 of the cap 5 and screwed into the sheath 14, spiral compression springs 17 being interposed between the heads of the spindles 15 and the bosses 16 to apply a tension normally tending to draw the bar 7 away from the rolls.

The calibrated scale may be marked on a hand wheel 12 of the micrometer screw 11 and related to a fixed pointer 13, or a movable calibrated plate or rings can be aflixed to the hand wheel 12.

Two such micrometer adjustments are provided suitably placed longitudinally to the bar '7 and roll 2 to ensure even pressure all along the bar 7 when both adjustments are set to the same calibrated readings, each division conveniently representing a one thousandth of an inch movement of the micrometer screw 11.

With an adjustable spring action and fine setting substantially as above described it will be readily understood that the breast bar 7 can be adjusted with perfect micrometer accuracy to a calibrated scale, the hand wheel 12 imparting an even and selected resilient spring pressure to the breast bar '7 by means of the spring 1 compressed to re-act at a predetermined pressure to the filmof paint, enamel, ink, soap, chocolate, or other fiuid or semi-fluid material under treatment in the mill, during its passage between the bar 7 and a roll 2, the actual pressure exerted on the film being controlled by the adjustment of the calibrated micrometer screws 11.

The breast bar may be preferably of close grained cast iron, or other suitable metal or alloy.

The saddle 6 may be of the hinged. type, but the hinge is not provided on the frame in the conventional manner but the hinge is on the frame cap, the object being to machine the caps in a suitable jig in pairs, ensuring the hinge holes being in perfect alignment. The main side frames may be similarly machined to ensure perfect alignment of the bearing slides and other levels and also of the stay bar lug holes. As shown the hopper base and throat and bar housing are formed integral with the saddle casting.

The hinged saddle 6 may be provided with a system of levers 18 and links 19 to facilitate raising and lowering for cleansing, etc., but we do not restrict ourselves to this method of raising and lowering or to the hinged saddle, as we may use a saddle rising and falling vertically on vertical guide bars and operated by a system of levers, etc., in place of the hinge. The saddle may be conveniently secured to the main side frames at the front by means of slotted lugs 20 on the saddle 6 and machined to seat on suitable lugs 21 on the side frames and accurately roachined.

The hopper 22 may be secured to the saddle hopper base 23 by screws, hinged bolts or any suitable method, and may slide on and off the hopper base, on machined slides.

The roll shaft may be journalled in suitable bearings which may be of the plain bush type or self-oiling, or ball or roller bearing, etc., housed in block housings machined to fit the slides in the frames and adjustable up and down by means of suitable adjustments to secure alignment with the breast bar, etc.

The delivery tray may be of the screw and spring pad adjustment sliding type, operating in slides machined in the supporting arms which are hinged on the necks of the bearings to permit of angular adjustment of the tray with respect to the roll.

A suitable lateral motion is preferably imparted to the roll and a gear drive may be provided from the counter-shaft carried by the side frame and upon which the driving pulleys are provided.

The method of housing and sealing the breast bar is preferably that described in our concurrent application Serial number 588,067 filed January 22nd, 1932.

As shown in Fig. 3 an expanded or recessed throat 23 may be formed at the base of the hopper to cause the material to partake of a spinning ction and prevent or minimize choking of the grinding nip by the coarser material or dross.

As illustrated the saddle has the hopper base or feed throat formed in it, also the slot into which the bar, bar sheath and housing are placed, so that the bar, sheath and housing com plete with the micrometer adjustments can be removed integral from the saddle, or the bar and sheath can be removed independently from the underside. When all assembled the saddle hopper base, hopper, bar and housings all rise together. The saddle has a permanent setting in relationship to the roll and frame. Adjustable sealing plates are used. An adjustable side sealing plate is indicated by (Fig. 3). The sealing plates may be slotted vertically on the face for the fixing screws so that when necessary the plates can be let down to the roll for maintaining the seal. With such an arrangement there is practically no pressure on the roll from the seals and therefore no wear or grooving of the roll and no discoloration of the paint due to hard friction, and no overheating.

The term in the claims bearing against the bar is intended to include a direct or an indirect bearing.

What we claim is:-

1. The combination in a roll and breast mill comprising a breast bar support inc ing a fixed part and a movable breast bar housing, a breast bar in said housing, a normally positive adjusting screw bearing against said breast bar housing, a member in screw threaded relation with said screw, a normally unyielding spring interposed between said member and said fixed part, and additional spring means normally tending to draw said breast bar housing into bearing relation with said screw, whereby the bar can be brought into the desired working setting with relation to the roll with little or no pressure between the surfaces thereof.

2. A roll and breast mill having a breast bar mounted in a housing, comprising in combination, a breast bar housing, a breast bartherein, fixed and movable members carried by said housings, springs between said fixed and movable members, adjusting members for said springs, the movable members projecting beyond said fixed members and being bored and internally threaded, means in connection with the projecting portion of the movable members for moving the movable members to adjust the springs to the pressure desired, and screws in threaded engagement with the bore of the spring adjusting members and bearing against the bar, and means continually urging said bar against said screws whereby the bar can be brought into desired working setting.

3. A roll and breast mill having a breast bar mounted in a housing, comprising in combination, a breast bar housing; a breast bar therein, boxes on said housing, springs in said boxes, adjusting members for said springs, the members projecting beyond said boxes and being bored and internally threaded, means in connection with the projecting portion of the movable members for moving the members to adjust the springs to the pressure desired, screws in threaded engagement with the bore of the spring adjusting members and bearing aga'mst the bar and spring actuated rods connected to the bar normally drawing the bar away from the roll and into contact with said screws, whereby the bar can be brought into the desired working setting.

4. A roll and breast mill comprising in combination, a hinged hopper saddle, a breast bar housing in said hopper saddle, a breast bar therein, impositive means continually urging said bar away from the roll, boxes on said housing, springs in said boxes, adjusting members for said springs, the members projecting beyond said boxes and having bores, means in connection with the projecting portion of the movable members for moving the members to adjust the springs to the pressure desired, and means in threaded relation with the bores of said members and bearing against the bar working in opposition to said impositive means and independently of the springs whereby the bar can be brought into desired working setting.

5. A roll and breast mill comprising in combination, a hinged hopper saddle, a breast bar housing in said hopper saddle, a breast bar therein, impositive means continually urging said bar away from the roll, boxes on said housing, springs in said boxes, tubes having flanged ends against which the springs bear, said tubes being located in said boxes and having portions projecting therebeyond, said tubes being internally and externally threaded, said external threading being on said projecting portions, screw nuts engaging said external threads to adjust the springs to the pressure desired, and screws in engagement with the internal threads of said tubes and bearing against the bar and acting in opposition to said impcsitive means whereby the bar can be brought into desired working setting.

6. A roll and breast mill comprising in combination, a hinged hopper saddle, a breast bar housing in said hopper saddle, a breast bar therein,

impositive means continually urging said bar away from the roll, boxes on the cap of said saddle, springs in said boxes, tubes in said boxes having flanged ends against which the springs bear, said tubes projecting beyond said boxes and being internally and externally threaded, said external threading being on said projecting portions, screw nuts engaging said external threads to adjust the springs to the pressure desired, screws engaging the internal threads of said tubes, hand wheels for rotating said screws, and calibrated scales co-operating therewith, said screws bearing against the bar and acting in opposition to said impositive means whereby the bar can be brought into desired working setting.

HENRY EDWARD COX.

JOHN ROWLAND TORRANCE. 

